[xen staging] x86/P2M: p2m_{alloc,free}_ptp() and p2m_alloc_table() are HVM-only

[patchbot@xxxxxxx]

commit 033ff90aa9c17306ae0026fd10f6532b2ea3fca2
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Apr 8 14:40:46 2022 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Apr 8 14:40:46 2022 +0200

    x86/P2M: p2m_{alloc,free}_ptp() and p2m_alloc_table() are HVM-only
    
    This also includes the two p2m related fields.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
    Reviewed-by: George Dunlap <george.dunlap@xxxxxxxxxx>
---
 xen/arch/x86/include/asm/p2m.h      | 12 ++++++------
 xen/arch/x86/mm/p2m.c               | 13 ++++++++++++-
 xen/arch/x86/mm/shadow/common.c     |  2 ++
 xen/drivers/passthrough/vtd/iommu.c |  2 ++
 4 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/xen/arch/x86/include/asm/p2m.h b/xen/arch/x86/include/asm/p2m.h
index 2d0783693e..30236daba3 100644
--- a/xen/arch/x86/include/asm/p2m.h
+++ b/xen/arch/x86/include/asm/p2m.h
@@ -208,9 +208,6 @@ struct p2m_domain {
     /* Lock that protects updates to the p2m */
     mm_rwlock_t           lock;
 
-    /* Shadow translated domain: p2m mapping */
-    pagetable_t        phys_table;
-
     /*
      * Same as a domain's dirty_cpumask but limited to
      * this p2m and those physical cpus whose vcpu's are in
@@ -229,9 +226,6 @@ struct p2m_domain {
      */
     p2m_access_t default_access;
 
-    /* Pages used to construct the p2m */
-    struct page_list_head pages;
-
     /* Host p2m: Log-dirty ranges registered for the domain. */
     struct rangeset   *logdirty_ranges;
 
@@ -239,6 +233,12 @@ struct p2m_domain {
     bool               global_logdirty;
 
 #ifdef CONFIG_HVM
+    /* Translated domain: p2m mapping */
+    pagetable_t        phys_table;
+
+    /* Pages used to construct the p2m */
+    struct page_list_head pages;
+
     /* Alternate p2m: count of vcpu's currently using this p2m. */
     atomic_t           active_vcpus;
 
diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index 4f739e27e4..48bff44a6a 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -93,7 +93,9 @@ static int p2m_initialise(struct domain *d, struct p2m_domain 
*p2m)
     int ret = 0;
 
     mm_rwlock_init(&p2m->lock);
+#ifdef CONFIG_HVM
     INIT_PAGE_LIST_HEAD(&p2m->pages);
+#endif
 
     p2m->domain = d;
     p2m->default_access = p2m_access_rwx;
@@ -627,6 +629,7 @@ struct page_info *p2m_get_page_from_gfn(
 }
 
 #ifdef CONFIG_HVM
+
 /* Returns: 0 for success, -errno for failure */
 int p2m_set_entry(struct p2m_domain *p2m, gfn_t gfn, mfn_t mfn,
                   unsigned int page_order, p2m_type_t p2mt, p2m_access_t p2ma)
@@ -666,7 +669,6 @@ int p2m_set_entry(struct p2m_domain *p2m, gfn_t gfn, mfn_t 
mfn,
 
     return rc;
 }
-#endif
 
 mfn_t p2m_alloc_ptp(struct p2m_domain *p2m, unsigned int level)
 {
@@ -745,6 +747,8 @@ int p2m_alloc_table(struct p2m_domain *p2m)
     return 0;
 }
 
+#endif /* CONFIG_HVM */
+
 /*
  * hvm fixme: when adding support for pvh non-hardware domains, this path must
  * cleanup any foreign p2m types (release refcnts on them).
@@ -753,7 +757,9 @@ void p2m_teardown(struct p2m_domain *p2m)
 /* Return all the p2m pages to Xen.
  * We know we don't have any extra mappings to these pages */
 {
+#ifdef CONFIG_HVM
     struct page_info *pg;
+#endif
     struct domain *d;
 
     if (p2m == NULL)
@@ -762,11 +768,16 @@ void p2m_teardown(struct p2m_domain *p2m)
     d = p2m->domain;
 
     p2m_lock(p2m);
+
     ASSERT(atomic_read(&d->shr_pages) == 0);
+
+#ifdef CONFIG_HVM
     p2m->phys_table = pagetable_null();
 
     while ( (pg = page_list_remove_head(&p2m->pages)) )
         d->arch.paging.free_page(d, pg);
+#endif
+
     p2m_unlock(p2m);
 }
 
diff --git a/xen/arch/x86/mm/shadow/common.c b/xen/arch/x86/mm/shadow/common.c
index 8f11190173..06a0f22906 100644
--- a/xen/arch/x86/mm/shadow/common.c
+++ b/xen/arch/x86/mm/shadow/common.c
@@ -2701,8 +2701,10 @@ int shadow_enable(struct domain *d, u32 mode)
  out_locked:
     paging_unlock(d);
  out_unlocked:
+#ifdef CONFIG_HVM
     if ( rv != 0 && !pagetable_is_null(p2m_get_pagetable(p2m)) )
         p2m_teardown(p2m);
+#endif
     if ( rv != 0 && pg != NULL )
     {
         pg->count_info &= ~PGC_count_mask;
diff --git a/xen/drivers/passthrough/vtd/iommu.c 
b/xen/drivers/passthrough/vtd/iommu.c
index 069427abb2..42b76af73f 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -374,6 +374,7 @@ static paddr_t domain_pgd_maddr(struct domain *d, paddr_t 
pgd_maddr,
 
     if ( pgd_maddr )
         /* nothing */;
+#ifdef CONFIG_HVM
     else if ( iommu_use_hap_pt(d) )
     {
         pagetable_t pgt = p2m_get_pagetable(p2m_get_hostp2m(d));
@@ -381,6 +382,7 @@ static paddr_t domain_pgd_maddr(struct domain *d, paddr_t 
pgd_maddr,
         pgd_maddr = pagetable_get_paddr(pgt);
     }
     else
+#endif
     {
         if ( !hd->arch.vtd.pgd_maddr )
         {
--
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